直流磁场对Mg-3Al-3Cu合金结晶取向及力学性能的影响
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摘要
研究了0~1.25 T的直流磁场对石墨型铸造Mg-3Al-3Cu合金凝固组织、结晶取向及力学性能的影响。结果表明:直流磁场对合金凝固组织的影响较小;当磁感应强度为1.25 T时,第二相的体积分数明显下降。合金原有的结晶取向受到抑制,并形成了新的择优取向。当磁感应强度为1.25 T时,合金在(100)、(110)面的择优生长最为显著。总体上来说,随着磁感应强度的增加,合金的抗拉强度和伸长率均得到了显著的提升;当磁感应强度为1.25 T时,抗拉强度为181.2 MPa,伸长率为1.77%,较未处理时分别提升了142.7 MPa和1.04%。
The influences of DC magnetic field(0-1.25 T)on solidification structure, crystalline orientation and mechanical properties of graphite mould casting Mg-3Al-3Cu alloy were studied. The results show that the influence of the DC magnetic field on the solidification structure of the alloy is small. When the magnetic induction intensity is 1.25 T, the volume fraction of the second phase decreases obviously. The original crystallographic orientation of the alloy is inhibited and new preferred orientation is formed. When the magnetic induction intensity is 1.25 T, the preferred growth of alloy in(100) and(110) surface is most remarkable. On the whole, with the increase of magnetic induction intensity, tensile strength and elongation of the alloy are improved significantly. When the magnetic induction intensity is 1.25 T, the tensile strength is181.2 MPa, and the elongation is 1.77%, which is increased by 142.7 MPa and 1.04% respectively, compared with the alloy without treatment.
The influences of DC magnetic field(0-1.25 T)on solidification structure, crystalline orientation and mechanical properties of graphite mould casting Mg-3Al-3Cu alloy were studied. The results show that the influence of the DC magnetic field on the solidification structure of the alloy is small. When the magnetic induction intensity is 1.25 T, the volume fraction of the second phase decreases obviously. The original crystallographic orientation of the alloy is inhibited and new preferred orientation is formed. When the magnetic induction intensity is 1.25 T, the preferred growth of alloy in(100) and(110) surface is most remarkable. On the whole, with the increase of magnetic induction intensity, tensile strength and elongation of the alloy are improved significantly. When the magnetic induction intensity is 1.25 T, the tensile strength is181.2 MPa, and the elongation is 1.77%, which is increased by 142.7 MPa and 1.04% respectively, compared with the alloy without treatment.
引文
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[3]陈振华,夏伟军,程永奇,等.镁合金织构与各向异性[J].中国有色金属学报,2005,15(1):1-11.
[4]李轶,程培元,华林,等.磁场对AZ91-0.8%RE合金组织性能的影响[J].热加工工艺,2008,37(10):11-14.
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[6]谭水淋,周全,万红.直流磁场对纯镁凝固组织和织构及力学性能的影响[J].特种铸造及有色合金,2014,34(11):1207-1210.
[7]黄曼青,周全.直流磁场对AZ31镁合金凝固组织和力学性能的影响[J].热加工工艺,2016,35(13):77-80.
[8]黄曼青,周全,刘峰,等.直流磁场对AZ91D镁合金凝固组织和力学性能的影响[J].特种铸造及有色合金,2016,36(3):320-323.
[9]包卫平,许光明,班春燕,等.静磁场对镁合金凝固组织的影响[J].物理学报,2004,53(6):2024-2028.
[10]Kim W J,Park J D,Wang J Y,et al.Realization of low-temperature superplasticity in Mg-Al-Zn alloy sheets processed by differential speed rolling[J].Scripta Materialia,2007,57(8):755-758.